Abstract
Zinc has been electrodeposited from alkaline zincate solutions onto steel substrate and its properties investigated as a function of overpotential of deposition. The ratio of disperse to compact deposit could be estimated from the results of anodic stripping coulometry. Electron microscopy, stereo-scanning electron microscopy and X-ray diffraction have been used to study the morphology, crystal orientation and lattice parameters, while the bet method rendered information about the specific surface area of the disperse part of the deposit. The yield and degree of dispersion of the disperse (dendritic) deposit have been found to increase with overpotential. The lattice parameters indicate residual stress in the compact part of the deposit. In one and the same deposit the orientation of the compact part was found to be while that of the dendrites was or . This selectivity of the two types of growth for particular types of crystal nuclei is explained in terms of a much faster growth on the (1010) or (1120) plane than on the (0001) plane, favoured by the structure of the plane at which continuous formation of new layers is possible by the mechanism of unidimensional nucleation.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
